This black plastic fuse holder replaces the original one used on many Dynaco solid state amplifiers, preamplifiers, amps, preamps, and tuners including but not limited to PAT-4, FM-5, ST-80, ST-120, SCA-80Q. If you only need the fuse holder cap I suggest you order this listing as it should work to replace the original one. Most of the caps available on Amazon will not work with your original holder because they are threaded or the wrong size.
eBay